Bethesda North Marriott Hotel & Conference Center. Featuring 447 guest rooms and approximately 50,000 square feet of event space adjacent to the area's Metro system, our hotel accommodations offer easy access to downtown Bethesda, Rockville, Washington, D.C., and northern Virginia. With a 23,700-square-foot ballroom, 120-seat amphitheater, innovative catering menus, and impeccable guest rooms and amenities, our conference center and hotel is the perfect union of form and function.